On the same page, you can tap Add Site Exception, type the URL, and hit Add to allow JavaScript to run on specific websites. Unfortunately, Chrome on iPhone doesn’t allow you to disable ...

This will disable JavaScript by default, but you can add exceptions to the rule. Under Allowed to use JavaScript , click Add to select the sites where you want to enable it.

Adding a JavaScript file to a Page using Page Properties. If you only want to use a JavaScript file on one page of your site, it's best to add it to one specific page using that page's Page Properties ...